Hi,
I've been looking at this for a few months now. As I understand it, you will need to apply to the BCMR with DD Form 149 to correct your RE code along with supporting documentation showing you are fit for duty. If/once they do what you ask you will need to come off retirement and start working with a recruiter who is willing to put in the paperwork/hours.
The info above is based on my research here and talking with recruiters who are willing to put in the work.
Oddly enough, I was a recruiter and never saw it happen as my station commander refused to "waste" the station's time. Just keep the goal in sight and realize you're in for a long process of being told no more than yes.
Good luck and keep us informed on your progress and process.